JP6004984B2 - Map drawing device - Google Patents

Description

  The present invention relates to a technique that achieves both adjustment of processing load of a map drawing device and visibility.

  2. Description of the Related Art Conventionally, in a map drawing device that displays a map such as a car navigation device, a high-quality display is performed by displaying in detail the shape of a drawing object such as a 3D (three-dimensional) figure.

  However, if a large number of drawing objects are drawn, the processing load on the CPU (Central Processing Unit) and the GPU (Graphics Processing Unit) (hereinafter, these are collectively referred to simply as processing load) increases. In particular, in a car navigation device in which various functions operate simultaneously, in addition to drawing, CPU or GPU processing resources (hereinafter, both are collectively referred to as processing resources) are consumed. When trying to draw a drawing object in detail, a sufficient drawing speed could not be realized, which was unusable for the user.

  Therefore, in order to draw detailed figures such as 3D figures at high speed, it has been proposed to reduce the drawing load by adjusting LOD (Level of detail) according to the viewpoint distance (distance from the camera). (For example, prior document 1). In 3D display, as the number of polygons representing a drawing object is increased, more detailed expression is possible. However, since the drawing object is displayed smaller as the viewpoint distance increases, when the viewpoint distance of the drawing object is sufficiently long, there is almost no difference in the actual appearance even if the number of polygons is displayed coarsely. The LOD technology uses this characteristic, and drawing objects with a short viewpoint distance are displayed in detail with many polygons, while drawing objects with a long viewpoint distance are displayed in a simplified manner with a reduced number of polygons. Reduction of processing resources is possible.

JP 2008-198105 A

  However, in the conventional map drawing apparatus, the distribution of the level of detail in the display surface is fixed regardless of which direction the user views the display screen. Therefore, for example, when the user visually recognizes the display screen from the right direction, if a drawing object displayed on the right side of the display screen close to the user is simply generated, it is difficult to present the information to the user in an easy-to-see manner. was.

  In view of the above-described problems, an object of the present invention is to provide a map drawing apparatus that performs an appropriate display in consideration of an arrangement direction of a display screen for a user.

  A map drawing apparatus of the present invention generates a drawing object from drawing object data and outputs the drawing object to a display unit, and obtains a user direction as a user direction with respect to the display screen of the display unit, and a display screen A simplicity setting unit that sets the simplicity in at least a part of the upper area so that the degree of simplicity indicating the degree of simplification of display continuously or discontinuously changes from one end to the other end of the area; A drawing object generation unit that generates a drawing object simplified according to a display position on the display screen from the drawing object data and outputs the drawing object to the display unit, and the simplicity setting unit is configured to display the display screen based on a user direction. Set the simplicity in at least some areas above.

  A map drawing apparatus of the present invention is a map drawing apparatus that generates a drawing object from drawing object data and outputs the drawing object to a display unit, and a user direction acquisition unit that acquires a user direction with respect to a display screen of the display unit as a user direction; Simplicity that sets simplicity in at least some areas on the display screen so that the degree of simplification indicating the degree of simplification of display changes continuously or discontinuously from one end to the other end of the area. A setting unit; and a drawing object generation unit that generates a simplified drawing object according to a display position on the display screen from the drawing object data and outputs the generated drawing object. The simplicity setting unit is based on a user direction. The degree of simplicity in at least a part of the area on the display screen is set. Therefore, it is possible to perform an appropriate display considering the arrangement direction of the display screen to the user.

It is a block diagram which shows the structure of the map drawing apparatus of Embodiment 1. FIG. 3 is a flowchart illustrating an operation of the map drawing device according to the first embodiment. It is a figure which shows the integrated range of a drawing object according to simplicity. It is a figure which shows the example of a display of the conventional map drawing apparatus. It is a figure which shows the example of a display of the map drawing apparatus of Embodiment 1. FIG. It is a figure which shows the example of a display of the map drawing apparatus of Embodiment 1. FIG. It is a figure which shows operation | movement of the map drawing apparatus of Embodiment 1. FIG. It is a figure which shows operation | movement of the map drawing apparatus of Embodiment 1. FIG. It is a block diagram which shows the structure of the map drawing apparatus of Embodiment 2. It is a figure which shows the example of a display of the map drawing apparatus of Embodiment 2. FIG. It is a figure which shows the example of a display of the map drawing apparatus of Embodiment 2. FIG. It is a figure which shows the example of a display of the map drawing apparatus of Embodiment 2. FIG. It is a figure which shows the example of a display of the map drawing apparatus of Embodiment 2. FIG. It is a figure which shows operation | movement of the map drawing apparatus of base technology.

<A. Prerequisite technology>
FIG. 14 shows the display of the map drawing apparatus of the base technology using the LOD technology. When a 3D map is used to represent a feature that is viewed obliquely downward from the top of the map, the viewpoint distance increases as the upper side of the display screen increases, and the drawing object is displayed smaller. Therefore, while displaying the drawing object in the lower half of the display screen in detail, if the drawing object in the upper half of the display screen is displayed in a simplified manner, the load of the drawing process can be reduced by the simplified display. I can do it. In FIG. 14, five buildings (drawing objects) are integrated into one on the upper side of the display screen, and thus the number of drawing objects can be reduced, and the load of drawing processing is reduced.

  If the area where the drawing object is displayed in detail is the detailed area, and the area where the drawing object is simply displayed is the simple area, according to the base technology, the position, size, and range of both areas on the display screen are It was fixed regardless of the arrangement direction.

  For example, when the display screen of the map drawing apparatus is installed on the right side toward the user, the user may mainly visually recognize the right side portion compared to the left side portion of the display screen. In such a case, visibility can be improved by drawing the drawing object displayed on the right side of the display screen in more detail than the drawing object displayed on the left side. In other words, the drawing object displayed on the left side of the display screen is drawn more simply than the drawing object displayed on the right side, thereby reducing the load of drawing processing without reducing visibility. Can do.

  However, in the conventional map drawing device in which the distribution of the drawing object in the display plane in the display plane is fixed, there is a problem that it is difficult to display appropriately in consideration of the arrangement direction of the display screen to the user.

<B. Embodiment 1>
In view of the problems of the base technology, according to the present invention, it is possible to perform appropriate display for the user by changing the in-plane distribution of the degree of simplicity of the drawing object according to the arrangement direction of the display screen to the user. To do.

<B-1. Configuration>
FIG. 1 is a block diagram showing a configuration of a car navigation device 10 which is an example of a map drawing device of the present invention. The car navigation device 10 includes an operation input unit 1, a control unit 2, a data storage unit 3, a state monitoring unit 4, a simplicity setting unit 5, a drawing object generation unit 6, an image composition unit 7, a display unit 8, and user direction acquisition. Part 9 is provided.

  The operation input unit 1 is an input interface of the car navigation device 10 and accepts user operations. The operation input unit 1 is constituted by, for example, a mechanical or electronic switch, and may be constituted by a car navigation device 10 and a remote controller in a separate housing. User operations accepted by the operation input unit 1 include map screen scroll information (scroll direction, scroll speed, scroll amount), map screen enlargement or scale operation, and the like.

  The state monitoring unit 4 stores state information indicating the state of the device. The state of the device includes the operation mode of the car navigation device 10 in addition to the CPU resource and the GPU resource of the car navigation device 10. The operation mode includes a normal mode and a power saving mode that consumes less power than the normal mode, and the control unit 2 determines which mode to operate in accordance with a predetermined condition, for example. Alternatively, the user may input and determine one of the operation modes from the operation input unit 1.

  The data storage unit 3 stores drawing object data (drawing object data) representing a map, and is configured by a storage medium such as a hard disk (Hard Disk Drive) or a memory. Or you may acquire drawing object data at any time by the radio | wireless communication from the server outside the car navigation apparatus 10. FIG. Here, the drawing object is a polygon that represents each feature on the map such as a house or a facility.

  The control unit 2 controls each component of the car navigation device 10. In particular, the control unit 2 acquires the state information of the state monitoring unit 4 and controls the simplicity setting unit 5 based on this.

  The simplicity setting unit 5 divides the display screen into a plurality of regions based on instructions from the control unit 2, and sets the simplicity of the drawing object for each region. Therefore, if the state information changes, the drawing object distribution also changes accordingly. In the present specification, the degree of simplification indicates the degree of simplification, and is defined as a drawing processing amount necessary for drawing a drawing object per unit area. An example of simplification is to integrate adjacent drawing objects into one drawing object. As the degree of simplicity increases, a wider range of drawing objects are integrated. Another example is to reduce the number of vertices of one drawing object. As the degree of simplicity increases, the drawing object is expressed with a smaller number of vertices. Another example is to unify the display colors of adjacent drawing objects. As the degree of simplicity increases, a wider range of drawing objects is expressed in the same color.

  In response to an instruction from the control unit 2, the drawing object generation unit 6 acquires drawing object data from the data storage unit 3, and further acquires the simplicity of the drawing object from the simplicity setting unit 5. The drawing object generation unit 6 includes a detailed drawing object generation unit 61, an intermediate drawing object generation unit 62, and a simple drawing object generation unit 63 that generate images of drawing objects according to the degree of simplicity. Here, an example is shown in the case where three areas with a degree of simplicity of 0, 1, and 2 are set on the display screen, and the detailed drawing object generation unit 61 generates a drawing object image composed of drawing objects with a degree of simplicity of 0. Similarly, the intermediate drawing object generation unit 62 generates a drawing object image with a simplicity of 1, and the simplified drawing object generation unit 63 generates a drawing object with a simplicity of 2, respectively. Specific generation contents will be described later with reference to FIG.

  The image composition unit 7 acquires the drawing object images generated for each simplicity by the drawing object generation unit 6, and outputs a display image created by combining them to the display unit 8.

  The display unit 8 is a monitor such as a liquid crystal display, and displays an image synthesized by the image synthesis unit 7. When the operation input unit 1 is configured with a touch panel, the operation input unit 1 and the display unit 8 are configured integrally.

  The user direction acquisition unit 9 includes, for example, a camera that captures the front of the display screen of the display unit 8, performs face detection processing on the image captured by the camera, and acquires the user direction (user direction) with respect to the display screen. To do. Alternatively, the user may input the user direction directly from the operation input unit 1. In this case, the operation input unit 1 also serves as the user direction acquisition unit 9. The user direction acquisition unit 9 outputs the acquired user direction to the control unit 2.

  The control unit 2, simplicity setting unit 5, drawing object generation unit 6, and image composition unit 7 are realized by a CPU (Central Processing Unit) that executes a program stored in a memory such as a RAM (Random Access Memory). . The state monitoring unit 4 is realized by a memory such as a RAM (Random Access Memory).

<B-2. Display operation>
Next, the image display operation of the car navigation device 10 will be described with reference to the flowchart of FIG. First, when the car navigation device 10 is powered on, the control unit 2 determines whether or not the user direction is acquired from the user direction acquisition unit 9 (step S1). If the user direction has not been acquired (No in step S1), the process stands by until acquisition. When acquiring the user direction (Yes in step S1), the control unit 2 determines whether or not the user direction has changed since the previous drawing (step S2). Here, for example, it is determined that the change has occurred when the change in the user direction is equal to or greater than a predetermined value, and it is determined that the user direction has changed at the time of the first drawing. If there is no change in the user direction (No in step S2), the process returns to step S1.

  If there is a change in the user direction (Yes in step S2), the simplicity setting unit 5 sets the simplicity of the drawing object in accordance with the instruction from the control unit 2 (step S3). FIG. 3 shows, as an example of simplification, the processing contents of the drawing object generation unit 6 when simplification is performed by integration processing of adjacent drawing objects according to the degree of simplification. When the simplicity is 0, the integration process is not performed. That is, the drawing object is generated according to the drawing object data without performing any simplification process with any drawing object adjacent to the drawing object. When the simplicity is 1, adjacent buildings (drawing objects) are integrated. When the simplicity is 2, a wider range of buildings (drawing objects) is integrated than when the simplicity is 1. When the simplicity is 3, all buildings (drawing objects) in the same section are integrated. In this way, the drawing object generation unit 6 increases the range of drawing objects for which the integration process is performed as the simplicity increases.

  Although FIG. 3 shows four simplifications (simplifications 0 to 3), the number of simplifications, that is, the number of display screen sections is not limited to this.

  Returning to FIG. 2, next, the drawing object generation unit 6 generates an image of the drawing object for each simplicity (step S <b> 4). The generated images for each degree of simplicity are combined into one image by the image combining unit (step S5) and output to the display unit 8 (step S6).

  Next, the control unit 2 determines whether or not the drawing program is finished (step S7). If the program is not finished, the process returns to step S1, and if the program is finished, the process is finished.

<B-3. Simplicity setting>
The simplicity setting unit 5 sets the simplicity of the display screen based on the user direction. FIG. 4 shows an example of setting the simplicity without considering the user direction. In the display screen shown in FIG. 4, a general LOD display is performed, and the display screen is divided into a detailed area (simplification level 0) and a simple area (simplification level 2) in order from the lower side. Further, the boundary line between the detailed area and the simplified area is parallel to the horizontal direction of the display screen.

  On the other hand, the car navigation apparatus 10 according to the first embodiment sets the simplicity of the display screen based on the user direction. When the user direction is the front of the display screen, the simplicity is set as in FIG. 4 (FIG. 5A), but when the user direction is the right direction toward the display screen, the left part of the display screen Is displayed in a simplified manner compared to the right part. Specifically, the left side of the boundary line between the simple area and the detailed area is bent downward so that the left area of the display area extends downward more than the other areas (FIG. 5B). . By setting the simplicity as shown in FIG. 5 (b), the simplicity is kept constant in the right part of the display screen that the user mainly views, while the simplicity of the other parts is lowered to reduce the visibility. It is possible to reduce the drawing load while maintaining the characteristics. In other words, visibility is improved by displaying the drawing object in detail at a position that is easy for the user to see.

  Further, when the user is in the front direction of the display screen, as shown in FIG. 6, a detailed area may be provided wider at the center of the display screen than at the left and right ends. That is, the boundary line between the simple region and the detailed region is a parabolic shape having a peak at the center of the display screen. It is possible to reduce the drawing load while maintaining visibility by taking a large detailed area at the center of the display screen that the user is expected to mainly view, and taking a simple area wider at the other parts than the center. Is possible. In other words, visibility is improved by displaying the drawing object in detail at a position that is easy for the user to see.

  5 and 6, a method has been described in which two or three regions having different simplicity are set on the display screen and the boundary line of the region is moved based on CPU resources or the like. In this way, when the display screen is divided into a finite number of regions and different simplicity is assigned, the change in simplicity is, for example, stepwise from the bottom to the top of the display image, as shown in FIG. As described above, the number of display screen sections is not limited to three in FIG. 7, and may be larger. If the number of divisions is increased as much as possible, the step width of the simplicity shown in FIG. 7 becomes extremely small, and it can be considered that the simplicity changes continuously as shown in FIG.

  In this case, the simplicity setting unit 5 defines a function f (x, y, Du) of simplicity instead of dividing the display screen into a plurality of areas and assigning simplicity. The function f uses the user direction Du as a parameter for the position on the display screen defined by the xy coordinates. The simplicity setting unit 5 changes the simplicity f (x, y) according to the user direction Du. In other words, the simplicity setting unit 5 changes the form of continuous change in simplicity according to the user direction. Thereby, suitable drawing according to the user direction can be performed.

<B-4. Modification>
Although the example which applied the map drawing apparatus of this invention to the car navigation apparatus 10 was demonstrated in the above description, the map drawing apparatus of this invention can be mounted in a vehicle, PND (Portable Navigation Device), and a portable terminal The present invention can also be applied to a navigation apparatus constructed as a system by appropriately combining (for example, a mobile phone, a smartphone, and a tablet) and a server. In this case, each function or each component of the car navigation device 10 described above is distributed and arranged in each device constituting the system.

  5 and 6, the simplicity is set based on the user direction for the entire display screen. However, when a map is displayed using a partial area of the display screen, the display screen is displayed. The above setting may be made for at least a part of the area.

  Further, although the present invention has been described with respect to simplification of a drawing object in 3D display, the present invention can also be applied to a bird view in which a 2D map is expressed from a viewpoint from above. In this case, simplification is possible by, for example, integrating 2D drawing objects, reducing the number of vertices, or unifying display colors.

<B-5. Effect>
The car navigation device 10 according to the first embodiment is a map drawing device that generates a drawing object from drawing object data and outputs the drawing object to the display unit 8, and acquires a user direction with respect to the display screen of the display unit 8. 9 and at least a part of the area on the display screen, the degree of simplicity is set so that the degree of simplicity indicating the degree of simplification of the display changes continuously or discontinuously from one end to the other end of the area. The simplicity setting unit 5 includes a drawing object generation unit 6 that generates a drawing object simplified according to the display position on the display screen from the drawing object data and outputs the drawing object to the display unit 8. Sets the degree of simplicity in at least a part of the area on the display screen based on the user direction. Therefore, for example, by displaying the portion of the display screen that is easy for the user to view in more detail than the other portions, it is possible to reduce the drawing load while maintaining visibility.

<C. Second Embodiment>
In the first embodiment, the application example of the present invention to the car navigation device 10 having the single view function for displaying an image in one direction from the display screen has been described. In the second embodiment, an application example of the present invention to a car navigation device 100 having a split view function for displaying different images in two different directions from a display screen will be described.

<C-1. Configuration>
FIG. 9 is a block diagram illustrating a configuration of the car navigation apparatus 100 according to the second embodiment. The configuration of the car navigation device 100 is different from the configuration of the car navigation device 10 of the first embodiment in that the operation input unit 11 is replaced with the operation input unit 1 and the drawing object generation unit 16 is replaced with the drawing object generation unit 6. The display unit 18 is provided in place of the display unit 8.

  The display unit 18 has a split view function and includes a first display unit 18R and a second display unit 18L that share a display screen. The first display unit 18R outputs the first image in the right direction toward the display screen, and the second display unit 18L outputs the second image in the left direction toward the display screen.

  The operation input unit 11 is an input interface of the car navigation device 10 and includes a first operation input unit 11R that receives a user operation on the first image and a second operation input unit 11L that receives a user operation on the second image. The first and second operation input units 11R and 11L may be configured by, for example, mechanical or electronic switches, and may be configured by a remote controller that is separate from the car navigation device 10. Further, the touch screen may be integrated with the first and second display units 18R and 18L. User operations received by the first and second operation input units 11R and 11L include map screen scroll information (scroll direction, scroll speed, scroll amount), map screen enlargement or scale operation, and the like.

  In response to an instruction from the control unit 2, the drawing object generation unit 16 acquires drawing object data from the data storage unit 3, and further acquires the simplicity of the drawing object from the simplicity setting unit 5. The drawing object generation unit 16 includes a first drawing object generation unit 16R that generates an image of the drawing object of the first image, and a second drawing object generation unit 16L that generates an image of the drawing object of the second image.

  The first drawing object generation unit 16R includes a detailed drawing object generation unit 16R1, an intermediate drawing object generation unit 16R2, and a simple drawing object generation unit 16R3 that generate images of drawing objects for each degree of simplicity. Similarly, the second drawing object generation unit 16L includes a detailed drawing object generation unit 16L1, an intermediate drawing object generation unit 16L2, and a simple drawing object generation unit 16L3 that generate images of drawing objects according to the degree of simplicity. In this example, both the first display image and the second display image show an example in which three areas having a degree of simplicity of 0, 1, and 2 are set on the display screen. Therefore, the number of simplicity categories is arbitrary.

  The detailed drawing object generation units 16R1 and 16L1 each generate a drawing object image made up of drawing objects with a simplicity of 0, and similarly, the intermediate drawing object generation units 16R2 and 16L2 simply draw a drawing object image with a simplicity of 1 The object generation units 16R3 and 16L3 generate drawing objects with a simplicity of 2, respectively.

  The image composition unit 7 acquires the drawing object images generated for each simplicity by the first drawing object generation unit 16R, combines them to create a first image, and outputs the first image to the first display unit 18R. Also, the drawing object image generated for each simplicity by the second drawing object generation unit 16L is acquired, and these are combined to create a second image, which is output to the second display unit 18L.

<C-2. Operation>
The basic operation of the car navigation device 100 is the same as the operation of the car navigation device 10 of the first embodiment shown in FIG. 2 except that the display image is two images, the first and second images. Omitted.

<C-3. Simplicity setting>
The car navigation device 100 is attached to a dashboard of a vehicle, and the first image is an image visually recognized by a driver as a first user, and the second image is an image visually recognized by a passenger in a passenger seat as a second user. To do.

  The simplicity setting unit 5 sets the simplicity of the display screen based on the user direction. FIG. 10 shows an example of setting the simplicity of the simplicity setting unit 5, and the first image is arranged on the right side and the second image is arranged on the left side for explanation. In the first image shown in FIG. 10 (a), the driver visually recognizes the display screen from the right direction, so the right side portion of the display screen close to the driver is provided with an intermediate region wider than the left side portion. Yes. In the second image of FIG. 10 (a), since the passenger sees the display screen from the left, the left side portion of the display screen close to the passenger is provided with an intermediate region wider than the right portion. . Thus, for each image, while maintaining the visibility by setting the simplicity so that the simplicity of the area of the display screen close to the viewer is smaller than the simplicity of other areas of the display screen The drawing processing load can be reduced.

  In the example of FIG. 10A, the display screen is divided into a lower detailed area and an upper intermediate area in both the first and second images, and the boundary line between the two areas is bilaterally symmetric in both images. In this way, the drawing object simplification process is equally applied to the first and second images, and the effect of reducing the drawing processing load by the simplification is the same for both images. In other words, the simplicity of the entire first image is the same as the simplicity of the entire second image.

  However, the degree of simplification may be provided for the first and second images. FIG. 10B shows an example in which simplification processing is preferentially performed on the second image, in other words, the simplicity of the entire first image is set lower than the simplicity of the entire second image. In both the first and second images, the boundary line between the intermediate area and the detailed area is parallel to the horizontal direction of the display screen and provided at the same height in the left portion of the display screen. However, in the right part of the display screen, the boundary line is still parallel to the horizontal direction of the display screen in the first image, whereas it is bent downward in the second image. By setting the degree of simplicity in this way, the second image can be preferentially simplified, so that the drawing processing load can be reduced while giving priority to the driver's visibility to the passengers.

  10C to 10E are examples in which the first image is simplified in preference to the second image, contrary to FIG. 10B. In FIG. 10C, in both the first and second images, the boundary line between the intermediate area and the detailed area is provided at the same height in the left part of the display screen, parallel to the horizontal direction of the display screen. However, in the right part of the display screen, the boundary line is still parallel to the horizontal direction of the display screen in the second image, whereas it is bent downward in the first image. In this case, it is possible to reduce the drawing processing load while giving priority to the driver's visibility to the driver.

  FIG. 10D is different from FIG. 10C in that the boundary line between the intermediate area and the detailed area is parallel to the horizontal direction of the display screen in the second image. FIG. 10E divides the display screen into a detailed area, an intermediate area, and a simplified area in the second image.

  FIG. 11 shows an example in which the degree of simplification of the entire display screen is changed according to the change of the CPU resource when the drawing object simplification process is performed equally to the first and second images. In FIG. 11, the first image is arranged on the right side and the second image is arranged on the left side. If the CPU resource is sufficiently large, the initial state is defined. In the initial state shown in FIG. 11A, the display screen is divided into a detailed area and a simplified area in both the first and second images. Parallel to the horizontal direction of the display image. When the CPU resource is reduced from the initial state, the boundary line bends downward on the left side of the display screen in the first image and on the right side of the display screen in the second image (FIG. 11B). When the CPU resource is further reduced from the state shown in FIG. 11B, the boundary line bends further downward in the first and second images. As shown in FIGS. 11B and 11C, in the first and second images, the boundary line between the intermediate region and the detailed region has a symmetrical shape, and the simplicity of the entire first image is the entire second image. It is the same as the degree of simplicity. By setting the degree of simplicity in this way, in each image, while displaying the drawing object in the display area closer to the viewer in detail, each image is simplified to the same extent according to the change in CPU resources, The drawing load can be adjusted.

  FIG. 12 shows an example in which the simplification degree of the entire display screen is changed according to the change of the CPU resource when the drawing object simplification process is preferentially performed on the second image. In FIG. 12, the first image is arranged on the right side and the second image is arranged on the left side. If the CPU resource is sufficiently large, the initial state is defined. In the initial state shown in FIG. 12A, in both the first and second images, the display screen is divided into a detailed area and a simplified area. Parallel to the horizontal direction of the display image. When the CPU resource is reduced from the initial state, the boundary line translates downward in the display screen in the second image, whereas the boundary line bends downward on the left side of the display screen in the first image. (FIG. 12B). When the CPU resource is further reduced from the state shown in FIG. 12B, the boundary line further translates downward in the display screen in the first image, and the boundary line further curves downward in the display screen in the second image. . As shown in FIGS. 12B and 12C, in the second image, the width of the intermediate area at the left end of the display screen in which the intermediate area expands most is equal to the width of the intermediate area in the first image. By setting the degree of simplicity in this way, it is possible to adjust the degree of simplicity according to the change in CPU resources and adjust the drawing load while giving priority to the driver's visibility to the passenger's visibility. In order to increase the simplicity of the first image, the position of the boundary line is fixed in the right part of the display screen according to the driver's direction, and the boundary line is moved downward only in the left part of the display screen. As a result, a decrease in the visibility of the driver is suppressed.

  FIG. 13 shows an example in which the simplification degree of the entire display screen is changed in accordance with the change of the CPU resource when the drawing object simplification process is preferentially performed on the second image. The difference from FIG. 12 is that as the CPU resource becomes smaller, the boundary line between the intermediate area and the detailed area in the first image moves downward while maintaining a state parallel to the horizontal direction of the display screen. Therefore, the driver's visibility is inevitably lowered as compared with the case shown in FIG. 12, but the drawing processing load as a whole can be greatly reduced.

  As described above, FIGS. 11 to 13 show examples in which the simplicity of the entire display screen is changed according to the change of the CPU resource. However, the change of the simplicity according to the change of the CPU resource is applied to the first embodiment. Is also possible.

  In the second embodiment, similarly to the first embodiment, the number of display screens to which different simplifications are assigned may be increased as much as possible, and the simplifications may be continuously changed in the display screen.

  In this case, the simplicity setting unit 5 defines a function f (x, y, E, Du) of simplicity instead of dividing the display screen into a plurality of areas and assigning simplicity. The function f uses the CPU resource E and the user direction Du as parameters for the position on the display screen defined by the xy coordinates. In other words, the simplicity setting unit 5 changes the form of continuous change in simplicity according to the user direction and CPU resources. Thereby, suitable drawing according to the user direction can be performed.

<C-4. Modification>
Although the example which applied the map drawing apparatus of this invention to the car navigation apparatus 100 was demonstrated in the above description, the map drawing apparatus of this invention can be mounted in a vehicle, PND (Portable Navigation Device), and a portable terminal The present invention can also be applied to a navigation apparatus constructed as a system by appropriately combining (for example, a mobile phone, a smartphone, and a tablet) and a server. In this case, each function or each component of the car navigation device 10 described above is distributed and arranged in each device constituting the system.

  Further, the modification described in the first embodiment can also be applied to the second embodiment.

<C-5. Effect>
In the car navigation device 100 (map drawing device) according to the second embodiment, the display unit 18 displays the first image for the driver (first user) in the first direction from the display screen, and the passenger seat in the second direction. The second image for the passenger (second user) is displayed, and the user direction acquisition unit 9 acquires the arrangement direction of the display screen of the display unit 18 with respect to the first user as the first direction, and displays on the display unit 18. The arrangement direction with respect to the second user of the screen is acquired as the second direction, and the simplicity setting unit 5 sets the simplicity based on the first direction for the first image, and in the second direction for the second image. Set simplicity based on. Therefore, in each split view image, it is possible to reduce the drawing load while maintaining the visibility of each user.

  In addition, the simplicity setting unit 5 sets the simplicity so that the simplicity of the entire first image is lower than the simplicity of the entire second image, so that the driver's visibility becomes the passenger's visibility. The drawing load can be adjusted while giving priority.

  In addition, the simplicity setting unit 5 sets a plurality of display areas on the display screen so that, in the first image, the simplicity is lower as the area is closer to the driver (first user). In this case, since the simplicity of the drawing object displayed on the part of the display screen that is mainly viewed by the driver is set low, the visibility is improved.

  In addition, the simplicity setting unit 5 sets a plurality of display areas on the display screen so that the simplicity of the area closer to the passenger (second user) in the passenger seat is lower in the second image. Since the degree of simplicity of the drawing object displayed on the part of the display screen that is mainly viewed by the passenger is set low, the visibility is improved.

  In addition, the simplicity setting unit 5 sets a plurality of display areas to which the drawing object is assigned for each predetermined simplicity in at least a part of the area on the display screen, and the plurality of display areas according to the change of the CPU resource. Move at least part of the border. For example, as the CPU resource decreases, the boundary line between two adjacent display areas is moved in a direction in which the area of the display area having a higher degree of simplicity increases. Thereby, it is possible to reduce the drawing load and suppress the reduction of the drawing speed.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

  2 control unit, 3 data storage unit, 4 state monitoring unit, 5 simplicity setting unit, 7 image composition unit, 9 user direction acquisition unit, 10,100 car navigation device, 11 operation input unit, 11L second operation input unit, 11R First operation input unit, 16 drawing object generation unit, 16L second drawing object generation unit, 16L1, 16R1, 61 detailed drawing object generation unit, 16L2, 16R2, 62 intermediate drawing object generation unit, 16L3, 16R3, 63 simplified drawing Object generation unit, 16R first drawing object generation unit, 18 display unit, 18L second display unit, 18R first display unit.

Claims (7)

A map drawing device that generates a drawing object from drawing object data and outputs the drawing object to a display unit,
A user direction acquisition unit that acquires a user direction as a user direction with respect to the display screen of the display unit;
Simplification for setting the simplification degree so that the simplification degree indicating the degree of simplification of display changes continuously or discontinuously from one end to the other end of the area on at least a part of the display screen. A degree setting section;
A drawing object generation unit that generates the drawing object having the simplicity according to the display position on the display screen from the drawing object data, and outputs the drawing object to the display unit;
With
The simplicity setting unit sets the simplicity in at least a part of the area on the display screen based on the user direction;
Map drawing device. The display unit displays a first image for a first user in a first direction from the display screen, and displays a second image for a second user in a second direction,
The user direction acquisition unit acquires the arrangement direction of the display screen of the display unit with respect to the first user as a first direction, acquires the arrangement direction of the display unit of the display screen with respect to the second user as a second direction,
The simplicity setting unit sets the simplicity based on the first direction for the first image, and sets the simplicity based on the second direction for the second image;
The map drawing apparatus according to claim 1. The simplicity setting unit sets the simplicity so that the simplicity of the entire first image is lower than the simplicity of the entire second image.
The map drawing apparatus according to claim 2. The degree of simplification setting unit, wherein in the first image, wherein as said degree of simplification closer area to the first user is low, sets the display region of the multiple,
The map drawing apparatus according to claim 2 or 3. The degree of simplification setting unit, wherein in the second image, wherein as said degree of simplification closer area to the second user is low, sets the display region of the multiple,
The map drawing apparatus in any one of Claims 2-4. The simplicity setting unit sets a plurality of display areas to which the drawing object is assigned for each predetermined simplicity in at least a part of the area on the display screen, and responds to a change in CPU resources of the map drawing apparatus. Moving at least a part of the boundary lines of the plurality of display areas,
The map drawing apparatus in any one of Claims 1-5. The simplicity setting unit moves a boundary line between two adjacent display areas in a direction in which the area of the display area having a greater simplicity becomes larger as the CPU resource decreases.
The map drawing apparatus according to claim 6.